DTC U0100-00, U0122-00, U0128-00 (Electric Brake Booster Control Unit: Without ACC)

DTC U0100-00  : CAN Communication Failure With ECM/PCM DTC U0122-00  : CAN Communication Failure With VSA DTC U0128-00  : CAN Communication Failure With Electric Parking Brake

NOTE: 

• Before you troubleshoot, review the general troubleshooting information .
• According to the detected DTC(s), check for the power circuit and the ground circuit of the control unit which cannot communicate with the electric brake booster.

DTC (Electric brake booster)

1. DTC check

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode, then wait 5 seconds or more.

   NOTE:  Do not open and close the driver's door.

   -4. Turn the vehicle to the ON mode.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame
   U0100-00 CAN Communication Failure With ECM/PCM
   U0122-00 CAN Communication Failure With VSA
   U0128-00 CAN Communication Failure With Electric Parking Brake

   Is DTC indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting . If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

2. Open wire check (F-CAN A_H, F-CAN A_L lines)

   -1. Turn the vehicle to the OFF (LOCK) mode with driver's door open.

   -2. Wait for 3 minutes.

   NOTE:  Do not close the driver's door.

   -3. Disconnect the following connectors according to the detected DTC.

   DTC	Connector
   	Electric brake booster 26P connector
   U0100-00	PCM connector A (50P)
   U0122-00	VSA modulator-control unit 46P connector
   U0128-00	VSA modulator-control unit 46P connector

   NOTE:  Jump the SCS line with the HDS, and wait more than 1 minute when disconnecting the PCM connector.

   -4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Transmitting control unit connector(s) for indicated DTCs: disconnected
   	Electric brake booster 26P connector: disconnected

   DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
   		Connector	Terminal	Connector	Terminal
   U0100-00	F-CAN A_H	Electric brake booster 26P connector	No. 26	PCM connector A (50P)	No. 37
   	F-CAN A_L		No. 18		No. 36
   U0122-00	F-CAN A_H	Electric brake booster 26P connector	No. 26	VSA modulator-control unit 46P connector	No. 20
   	F-CAN A_L		No. 18		No. 21
   U0128-00	F-CAN A_H	Electric brake booster 26P connector	No. 26	VSA modulator-control unit 46P connector	No. 20
   	F-CAN A_L		No. 18		No. 21

   Is there continuity?

   YES 

   Go to step 3.

   NO 

   Repair an open in the wire between the receiving control unit and the transmitting control unit.

3. Open wire check (F-CAN B_H, F-CAN B_L lines)

   -1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Transmitting control unit connector(s) for indicated DTCs: disconnected
   	Electric brake booster 26P connector: disconnected

   DTC	Circuit name	Test point 1 (Receiving control unit)		Test point 2 (Transmitting control unit)
   		Connector	Terminal	Connector	Terminal
   U0100-00	F-CAN B_H	Electric brake booster 26P connector	No. 19	PCM connector A (50P)	No. 39
   	F-CAN B_L		No. 12		No. 38
   U0122-00	F-CAN B_H	Electric brake booster 26P connector	No. 19	VSA modulator-control unit 46P connector	No. 24
   	F-CAN B_L		No. 12		No. 25
   U0128-00	F-CAN B_H	Electric brake booster 26P connector	No. 19	VSA modulator-control unit 46P connector	No. 24
   	F-CAN B_L		No. 12		No. 25

   Is there continuity?

   YES 

   The F-CAN B_H and F-CAN B_L wires are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. According to the detected DTC on the following table, substitute or replace the correspond control unit.

   DTC	Transmitting Control Unit
   U0100-00	PCM
   U0122-00	VSA modulator-control unit
   U0128-00	VSA modulator-control unit

   NO 

   Repair an open in the wire between the receiving control unit and the transmitting control unit.